Impact device



April 24, 1956 E. c. CLARKE El AL IMPACT DEVICE l0 Sheets-Sheet 1 FiledJan. 26, 1953 April 24, 1956 E. c. CLARKE ET AL 2,742,802

IMPACT DEVICE Filed Jan. 26, 1953 10 Sheets-Sheet 2 IV W April 24, 1956E. c. CLARKE ET AL 2,742,802

IMPACT DEVICE Filed Jan. 26, 1953 10 Sheets-Sheet 3 E aya 7 15* 'wmm. V/59 E. C. CLARKE El AL IMPACT DEVICE l0 Sheets-Sheet 4 April 24, 1956Filed Jan. 26 1953 April 24, 1956 IMPACT DE Filed Jan. 26. 1955 E. C.CLARKE El AL VICE l0 Sheets-Sheet 5 April 24, 1956 E. c. CLARKE ET AL2,742,802

M IMPACT DEVICE Filed Jan. 26, 1953 10 Sheets-Sheet 6 April 24, 1956 E.c. CLARKE- ET AL 2,742,802

IMPACT DEVICE Filed Jan. 26. 1953 10 Sheets-Sheet 7 April 1956 E. c.CLARKE ET AL 2,742,802

IMPACT DEVICE Filed Jan. 26. 1955 1o Sheets-Sheet s 70L-FV'1/75 70 /1 75April 1956 E. c. CLARKE El AL 2,742,802

IMPACT DEVICE Filed Jan. 26, 1953 10 Sheets-Sheet 9 April 24, 195 6 E.c. CLARKE Er AL IMPACT DEVICE l0 Sheets-Sheet 10 Filed Jan. 26. 1953 m mI .Cohtinua'tion of abandoned 2,742,802 IMPACT DEVICE 'Eugene 'Q- Clarkeand Henry-A. 'We'yer; 'Chamberslmrg,

l Ba azassignorslto: Chambersburg -Engineering Company,

ZChambersburg, :Pa., :1 corporation'iofrPennsylvania I applicationJ'Serial 'No.

* 684; 8 3, July 14, 1946. 'This:applicafion"January 26,

1953;Serial N 0. 833128 claims. oi. 78-20) 'This;invention relates toforging apparatusand more 'pa'rticularlvtota'forging apparatus of'theimpact .type

and is'av continuation of applicationiserial No.'684;583, :filed July14,1946, now abandoned.

An important object "of'thef invention is the provision of an apparatusof this characterin which the-force of impact is absorbed by the impact,elements thereby eliminating the necessity 'for. the heavy; foundations,and

anvil structures ordinarily associated with such .apparatus.

Another object of the invention isH-theprovision of an apparatusof thischaracter whichis soar-ranged that. the work feeding is materially"facilitated.

More specifically, an object Ofthisinvention.is,to;provide an impactapparatus-in whichzapair of .opposed horizontallytdisposed. ramsarelbrought into..impact, engagement for the purpose of, forging,coining, branding; compressing or welding material therebetween. and 1inwwhich the construction is such that.theuspeedt,ofwoperation of therams and theirpoint ofimpactmay be veryaccuratelyiregulated, thusenabling. 'the apparatus to be. conveniently utilized automatically.invconjunction with timed feeding mechanismsin which, ifdesired, the,fed material being ,forged' may-be delivered by gravity'between..thedies.

.Another object of the. inventionds. to provide an apparatus .of thischaracter whichlisextrcmelyasimple and maybe very readilylcontrolledinoperation totvarythe acceleration force actingon..-'the.,rams:andhenceuthe impact velocity, achieved.

A further object ,of .itheinvention is,.to, provide an; ap paratus-toffthe. stated character whiclris so constructed and arrange'dtasl to.be capabletoftcomplete :enclosure of the'fior'ging zone toftherebyeliminate. the, 'p ossibility ,of the accidents incident to "the ..useof forgingiapparatus of theordinarylcharacterwith its .openiforging.chamber andtove'rhanging parts, and also to, -provide an...enclosure int which a completely cont-rolled atmosphere .may be maintained -forefiicientlhea'ting; and ,working, of metal articles. I

These andotherobjects. wetattain, by.the;. construction illustrated'inthe accompanyingfldrawings.,w.herein for .the purpose ofiillu'str'ationwe'. have, shown variousadaptations v offour invention and wherein:

FigJ. l-kisa. viewpartia'lly'in. sectionflofta forging apparatusconstructedlinnaccordance, with our invention;

it Fig.:.2 isanenlarged sectional view,-on:line-72-;2; Eig.-. 1;

3 s is :a detail sectional t view. ithroughtthe, control valve; i

Fig. 4. isa section ,online'- 4-4, Fig. i 1;

Fig. :5Misa. fragmentary.side..elevation partiallyinxsectionfillustratinga method of? controlling overrrunning-aof theimpact'rams;

t-Fig :f7,:.;is acpartial. .transversezzsectional view tthrough the:fo'rgingi 1 apparatus 2 showing: one; typeset *WOIkJIfEGdiIIgmechanismnusableetherewith; .1

ice

' Fig. 8 .is..a=vertical-.sectional view takenionvlincfl8- -8, f Fig. 7;

Fig, 9 isv acontrol diagram for. the: mechanism illustrated in Figs. 7and 8;

Fig. 10 is. a side elevation .Ofrfl mechanism for mechan--icallyrfeedingtarticles between thendies; I a

Fig; 11 is asectional plan viewofthemechanism takeni onfl ine', 11-7-11,Fig. 10; v Fig. 12tis a fragmentary section on ,line 12-12,,

Fig. 15 is a-side'elevation partially insection showing 7 a: modifiedversion of the; forgingepparatus;

.Fig. 16 is asection on line'1-6-.16, Fig.,15; Fig.1l7 .is a, partiallydiagrammatic .plan view' of another feeding. mechanism;

Fig. 18 is-a. section on 1ine 18-.18,- Fig, 17; .Fig. 19 ,is -afragmentary, section on .line 19-49 of Big. 17;,and

"'Fig.,,20,is an illustration of a wiring diagramand associatedelectrical mechanisms which maybe employed 'forfeeding'the .Workintimed. relation, to operation of the rams and forcont'r'ollingover-running .ofvsaid rams.

Referring now to'fthe drawings and .more, particularly tofEigsa 1. to'6fthereofg the.numeral 10 designates a frame which mountsa pair of.opposed horizontal cylindersll in which operate pistons 12. Theadjacent, opposedcnds of thecylinders 11 each, mount acombinedhglandandguide structure 13 within which, operates a ram or die carrier L14attached to the associated piston 12. The ramsil l, more clearly "shownin'Fig.l2,. areprovided with 'flats' 15 whichv prevent their rotation,and the correspondin'glyflatte'd portions of 't'heglands lfi" areprovided with replaceable wearplates indicated ,at 16. The outer ends oftherams 14 are constructed as indicated at 17'for- "the receptionof'forging "dies 18.

flThe cylinders 11 are supplied with fiuid under pressure through asuitable control valve 19 to which ,fluid .is supplied through inlet 22at a pressure selectively regulated by means of a pressure regulatorvalve' V. j In the present instance the valve 19,.is of the type havinga piston' 2'1 operated by a solenoid20 to' control the delivery ofiiuidpressure from the.inlet'22 toythe opposite ends of the cylinders llthroughdelivery passages 24,"and' the exhaust fluid from the,cylinders'11 'is returnedythrough lines123 to valve19 and theexhaustlines'ZS. Valves '26 are provided in the' delivery"passages 24and'these.

valves are equipped with suitable. meansl.27 operable to permitg'them tobe" very accurately positioned.

"The valve19is ofsuch character that thezamount or fluid delivered toat" least'the outer ends of the cylindersspring28 and with a valve ofproper size, actuatiomofithe solenoid- 20,,need only. be. momentary.

-With reference-tito the pressureregulator.valve Kit is tobenote'dthatiadjnstmentjpf .thistvalve serves, effectively to controlt-the energy: delivered :-to the; cylinders :11- "to I actuateutheramsmand, since;,the ramsioperate in za horizontal P1EH6h3l1d @their;acceleration and :zdecelerationds notzaifected bygravityssojthat:equalrvelocities,10f. thel two rams isiachievedg itgiscpointedzounthat aadjustmentsof ithe valve:M:carr;besemployeii'rat'willxtomary the accelerating force acting on the rams andconsequently vary the impact velocities therebetween. This is animportant characteristic of the present invention and functionsadvantage ously not only in regulating the impact velocities accuratelyto the flow characteristic of the metal to be worked, but also as a partof the timed cycle when the device is used in conjunction with automaticfeed devices and the like.

With a structure of this character, the dies 18 can be made to meet veryexactly at an intermediate point despite the fact that machininglimitations and differences in packing pressures will ordinarily resultin meeting of these dies at one or the other side of a desired point.The valves 26 will permit close regulation of the amount of fluidpressure which may be delivered to the outer ends of cylinders 11 andthus afford compensation for many inequalities of operation as wouldresult from the features above mentioned.

It follows that an apparatus of this character may be very readilysupplied with material to be worked. Since the point of impact isexactly ascertainable, work guides 29 of the character suggested inFigs. and 16 very readily may be utilized to support work which is to besubmitted to simple forging operations. It furthermore becomes possibleto feed work to the dies by simply releasing the work at a given levelabove the point of impact between the dies, in a given timed relation tothe operation of the rams so that such Work will be caught between therams 14 as they come together.

A structure such as this is suggested in Figs. 1 and 2 in which one ofthe cylinders 11 mounts a bracket 30 upon which is vertically adjustablea slide 31 having clamps 32 to receive the material to be forged, theseclamps being operated by a solenoid 33. The solenoid 33 obviously may beactuated in timed operation with the solenoid 2 controlling valve 19 orsaid solenoids may be operated simultaneously, and any inaccuracy intiming may be compensated for by vertical adjustment of slide 31. if thevertical adjustment of the slide 31 with respect to the point of impactis such that the work will arrive at the point of impact at the propermoment, the solenoids 20 and 33 may be operated simultaneously. it willalso be observed that by employing an automatic timer in the circuitincluding the said solenoids, it .wlll be possible to operate solenoid20 first, followed by operation of solenoid 33, or to operate solenoid33 first, followed by operation of solenoid 20. While the presentillustration is that of a single time feed, it is obviously readilypossible to so modify this construction that consecutive feeds may bemade from a hopper.

Packing wear and other fluid losses may, at times, be the cause ofmisaligned impact between the dies 13, and means preferably are providedfor interrupting operation of the mechanism in event either of the rams14 overtravels its predetermined stroke. Such a means is illustrated inFigs. 5 and 6 and in the wiring diagram of Fig. 20, as comprising alimit switch 34 arranged in the path of a trip 35 on each of the impactrams 14 shown as mounted upon the die holder 36 of each of the rams 14,these switches being normally closed but being operated to open circuitposition upon over-travel of either of their associated rams tointerrupt the circuit containing the solenoids 20 and 33, thus renderingthe driving mechanism temporarily inoperative to again actuate the rams.Any other suitable means may be employed to this end.

In Fig. 20 of the accompanying drawings, we have shown by way ofillustration, a relatively simple wiring diagram of an electricalcircuit including solenoids 20 and 33, an adjustable timer 109, acircuit closing switch 110, and limit switches 34, 34. As above stated,limit switches 34, 34 are normally in their closed circuit positions. Itwill be obvious that when switch 110 is closed and switches 34, 34occupy their normal closed positions, current will flow from the sourceto initially energize solenoid 20 to supply fluid under pressure throughcontrol valve 19 to cylinders 11 to simultaneously actuate the rams 14.This actuation of the rams is followed by energization of the solenoid33, the time interval between actuation of solenoids 20 and 33 beingdetermined by the setting of the adjustable timer 109, which adjustmentinsures the proper arrival of the work at the point of impact of therams 14. There may be instances Where it will be desirable to releasethe work by energization of the solenoid 33 in advance of energizationof solenoid 20 in order to insure proper arrival of the work at thepoint of impact of the rams 14, in which event the positions of thesolenoids 20 and 33 in the circuit shown in Fig. 20 would be reversed,so that the delayed action effected by adjustable timer 189 would causeinitial operation of solenoid 33 followed by operation of solenoid 20.If the position of the slide 31 with respect to the point of impactbetween rams 14 is such that the work, when released, will properlyarrive at the point of contact between the rams 14, the operation ofsolenoids 20 and 33 may be simultaneous and the inclusion of theadjustable timer M9 in the circuit is not necessary, i. e. the solenoidswill operate simultaneously rather than sequentially. It will be readilyapparent that when either of the rams 14 over-travels, its associatedswitch 34 will be actuated to open position whereupon the circuit willbe opened and the impelling means will be rendered inoperative to againactuate the rams.

Since the operation of the control valve need only be momentary, thisoperation may be very readily controlled by automatic work feedingmechanisms. One such mechanism is illustrated in Figs. 7 and 8 of thedrawings in which the numeral 37 designates a rotatable work holderwhich is actuated through a plurality of stations by a latch 38 in turnoperated by a solenoid 39. At each station the work holder 37 is heldthrough a suitable positioning means generally designated at 49. Thework holder includes toggle clamps 41 corresponding in number andarrangement to the positions of the work holder, each of these clampscomprising a pair of clamping arms 42 forced together by springs 43 togrip the work W. The arms 42 are pivoted to brackets 44 secured to thework holder and are connected adjacent their outer ends by toggle links45 which are pivoted to blocks 46 secured to control rods 47. The innerends of these control rods have heads 48 provided with tappet rollers 49adapted for engagement with a stationary cam 50.

Pivotal movement of the links 45 in one direction is limited byengagement of the blocks 46 with the brackets 44 when no work-piece isheld between the clamping arms 42, and when a work-piece is clampedbetween said arms 42 pivotal movement of the links 45 in said onedirection is limited by engagement of the clamping arms 42 upon thework-piece. On the other hand, movement of the links 45 in the oppositedirection is limited by engagement of the heads 48 with the inner facesof the brackets 44. It will be obvious that with such a construction, ifthe rods 47 are forced outwardly, the action of springs 43 will, afterthe pivotal connection between links 45 has passed a line connecting thepivots of these links to the arms 42, constantly urge the rods 47outwardly since the spring action will tend to move the pivot outwardly.The clamp, therefore, once opened will remain open until the rod 47 isforced inwardly sufficiently to move this pivotal connection beyondalignment with the pivots of the links 45 to the arms 42 and thus may beoperated by abutting the work there against as suggested to the left ofFig. 7. At this time the rod 47 will move rapidly inwardly under thespring influence, causing the arms 42 to grasp the work. This stationfor inserting work will hereinafter be referred to as station I.

The succeeding station 11 brings the work held in the arms 42 intoengagement with a resistance heating element (not shown) so that thework is brought up to forging heat. Passing from this station II to thework- ".5 .pieceminterrupts'..acbeamof; light toaa photoelectric. cell.device laand r movestonto T station III where. the work-.pieceisdisposed inalignrnent with the .dies 18av and posi- .tioned for.forgingo contact thereby. In 1 station IV .the movementioftheworkholder 37. brings the heads-48, and more. specificallyirherollers --49Jthereof,:intoengagement ,theccam750zthereby forcingthe rods47 outwardly and lopening,theearmsAZto,penmit'release of the forged.artic e.

. In Big: r9..we..have illustrated .a .line. diagram .of controls forthe, .inlpacter .withthefeeding :mechanism just described, .the,.power-.-circuits being illustrated by single .heavy .lines and.thecontrol wiring by 'lightlines. Referring to this diagram andassuming that stock W has been .-manually.placed.inthelmachineat.stationtI, operation is .initiated ..by..temporarily.:closing. the v starting button 52 .thereby. energizing...solenoid -39 tocause the work to be a'dvancedinto position IIeand.simultaneously. closingv .the circuit ..of .;theresistancecheatingeelement (not. shown) through :the..time.-delayre1ay.and..timer.. 53. After a preselected .time .the relay: and timer:53 .willact to disconnect vthe resistance heaters andiagain energizethe a positioning solenoid 39. to.. advance. .thework another step, tostation IIL- Ascthework W.interruptsthelightibeamHto thephotoelectriacell 51,. amomentaryimpulse trips thetime-.-delay.=relay,54. After ashort interval. the. solenoid .20 of valve 19is energized, causing.theimpacterrdiesflto.strikethWOlknWhlChdlS.HOW-at; stationHI. A- portion :of .thecurrentimpulsefrom.therphotoelectricidevice 51 is.utilized to. .triptherelay. 54. controlling. .theheater element through the time-delay relayandtimer 53,;thus.initiatingasecond cycle. .Theapparatus willcontinuetofunction until thecircuit is interrupted tinv some :mannenonbyfailure-of the machineto. contain stockattheftimetof movement of:a-work.holderbythephotoelectric cell. ..It will-be-noted that the machine-thusincorporatesmeans.toprevent. any accidental engagement of thedies18a$when thereis no work present. lmFigs. 1.0...to 14 .we.haverillustrated. amechanism for .mechanicallytfeeding. articles .such.as: files or .the like. between dies. forengagementthereby. In-these..figures the numeral .60. generallyadesignatesa frame which. maybe secured to the impacter frame :in. any suitable manner, this ..frame:60. embodying vertical .guides .61 upon which is verticallyslidable.the carriagetfiz. Vertical reciprocation bf-thiscarriage- 62,.whichincludes upper and lower plates 63. secured. .to .one .anotherbytubes 64..embracing .theiguides .61, is. obtained .by. .acam. bar..65.slidably engaged betWeenQthese.platesLGlZand .pivotallymountedmpon acam diScGGZdIivenl-by .a.constant speedshaft 67 :The vuppertplate. 63mounts a pair of stationary clamping rollers 68, which are spacedfrom..one anotherin a ..direction transverse. toQthe. impacter.-"Between the. plates .63, .and

upon a pivot orrpin 69, there is mounted. a bell crank lever '70 and.above the upper plate 63 on 'sa'idflpivot .pin 69 'the'relis mounted amovable arm 71 carrying :a clamping rolle'r72 which is arranged in thesame plane as clamping roller 68. ..This movable clamping roller 72normally is .positionedso that'itsface is'in alignment'with the adjacentfaces of clamping rollersj'68,"being urged to this position by aspring"73; associated'with" one: arm'of'the' bell crank "lfhe c ither arm ofthe b'ell crank -"70 has an extension 74,the"terrninal portionof'whichnormally is disposed in close proximity to the' faceof cam disc 66.Shortly after "thecarriage 62-arrives at *its lowermost position (aninterval longenouglrto permit actuation of the impacter rams),jthe-cambar"65 comes into engagement with the extension 74 crane bell crankdever1 70 and rotates the 'latterabout 'its -pivot 69 against 'the'action ofspring73, thereby' sliiftingthe movable clamping roller 72-to therightand'relea'sing the work=which is disposed between the clampingroller 72=and the'rollers 68. The engagement of camihan 65 With'eiitension 74 continues and maintains the movable? roller 72initswvithdrawn position .until carriage 62 has-reachedtheiupperlimit ofitstravel.

.s rzaaeoa .zDepending from-1a suitablerhppper i(notsshown) arevert-teal guides Z5 and-=76; .the guide t75iiex tending. slightlybelowdhe; guide 76 zandzhaving at its lowerrend 'a shoulderfollowing-removal :ofneachxpiecei thereof, suitable light.springss'ZSrbeing emPloyedr-tmtholdrthe. pieces. "of workinthis-position. swhenithe'z carriage e62: reaches the :upper limitrrofits travel, .dhe: clamping: rollers 681confr0ntathe "work-piece ints1ightly:.-::spaced': relation thereto :and the rollerll'cisz'arrangediat ltheroppois'itezside ofthe'work piece jtfro'm the.rollers268. t-At' ihis ="timefcamtsbar' 65 .Edisengages frorneextension' '74 'gp'ermitting :Zthe :bell crank i to. move.nndersififiuence'cof; spring :7 3, :itherebyt' moving "roller 7 2 tounseatarthe work fromothezshoulder 77:.and clamp the:workibetweenstationaryrollers 68*.and the roller 72. The idownwardtravelioft-theicar'riage.62awilL of course,= at' the lower-limitthereofgtbe accompaniedby a substantial dwell during-which the carr-iageis substantially stationary, and

at this time a :trip Scam 79 "on' 'the periphery of eam disc-66=momentar ily trips a-sWitch' 80-toenergize the solenoid 20 andactuate valve 19 and accordingly. 'theimpacter rams. The" structure "sofar described' contemplates an apparatus which' zis operatedbyi-receiver' pressure controlled through a single valve. This-structureis obviouslycapable f considerable 'mddification. In Fig.11'5' wehave"il- "lustrated a structure a-where the irnpacter mechanism and 'thepressure 'fiu'id -source are incorporate'd -in -a single mechanism. I Inthis'=structure the supporting base 81ofthe'machine"provides-compressofi'cylinders 82; 'the pistons "83 er"which -arerlriyen by crahks5'84= throu'gh' gears 85 'from a commond'rive -sd Theends ofthe compressor 'oylinders 82'are connected -to' theimpacter cylinders 11a through 'yalves s' l at; present shown asconnected to one I ano'ther forsimultaneous operation through links88'con- "taining'xan adjustment such as turnbuckle- 89, which will'permit adjustmentofi the p'osition' of the intake valves to the'-outer'-e'ndsoflthe impacter cylinders to obtain 'the adjustmentnecessary to insure proper meeting ofthe'dies upon the works Aslikewiseshowniir this 'figure, the con- '-trol-'of such a valvemechanismtmay' comprise the usual treadle idevice' 'flfl mounted. ona'rock shaft 91 connected tolithe valye mechanism by links 92,=-and inthis connecfor: example; the. alloy materials employed in preparationofi'zthe heats inimetallurgical furnaces. ';As ordinarily prepared; .thegranules '..are.:con-solidated in substantially"cylindricaliblo'cksiintoiwvhichnhe granules have beencom- "pressedansordinary toggle .press. Due torpressure' limitations and lack ofimpact force in such a press, the 'cylinders are usually quiteffriableand when stored in any considerable:quantity,i::tend :to.:lose.iportionsa of their im :portant content. Y

Jinn-accordance aiwithnihet arrangementashown in Figs.17,.18-and19ofgthedrawings, we provide arotatable hold- =inga plater95vwhich: iSrI subjected ..to step-tby-step rotation through. the:imedium: of -athydraulic.cylinder '96," the'piston- 96a ofwhichzoperates a' push pawl 98 engagingatserieszof pins 99 securedatoziheuplate 95. Afterieacha'ctuatiorr'oflthe pawl 93,5the plate95 is.held in proper;alignment I'With-idie selements 100 carried by the; rams97 through .anyisuitahle'.holding'imechanism-such as that suggested at101. The-cylindrical preforms 102' prepared 'as previously describedarefed through a hopper 103-= toa point in alignment with one of'aseries of openings 104 in platef 95. Theseiop eningsil05 align with'thehopper feed atia' position, for.-1example,'- 9.0 "j ina advance ofalignment of= the openingi 104 avith 1the impact dies' 1 00of rams 97.

7 At this position through a pusher cylinder 105 operating a pair oframs 106 and 107 between each step of rotation of plate 95, the ram 106ejects a preform 102 from the hopper 103 and forces it into position inthe aligned opening 104. Upon the succeeding step of rotation of theplate 95' the preform 102 supplied to the opening 104 is placed inalignment with the dies 100 of the impact rams 97 and through impacttherebetween the preform 102 is consolidated to such an extent that itis no longer friable and may be readily stored in bins without loss ofweight. The following step of rotation of plate 95 brings the compactedforms 102a into alignment with ram 107 by means of which it is ejectedto a discharge. chute 108.

In describing this construction we have illustrated the plate as havingfour operative positions with a resultant operation of rams 106 and 107for each step of rotation of the plate. It will, however, be obviousthat the number of plate positions can be multiplied as desired in whichevent the operations will occur, not after consecutive steps of rotationof the plate but after a predetermined series of steps.

From the foregoing description it will be apparent that the presentinvention provides an impact apparatus which is constructed and arrangedin such a manner that the source of impact is absorbed by the impactelements thereby eliminating the necessity for the heavy foundations andanvil structures ordinarily associated with such apparatus. Theinvention also provides an impact apparatus having a pair of opposedhorizontally disposed rams which are brought into impact engagement forthe purpose of forging, coining, branding, compressing and weldingmaterial therebetween wherein the construction is such that the speed ofoperation of the rams and their point of impact may be very accuratelyregulated thus enabling the apparatus to be conveniently utilizedautomatically in conjunction with timed feeding mechanisms in which, ifdesired, the fed material to be forged may be delivered by gravitybetween the dies.

The invention, furthermore, provides an impact apparatus which isextremely simple and may be very readily controlled in operation to'varythe acceleration force acting on the rams and hence the impact velocitytherebetween.

The invention also provides an apparatus of the stated character whichis designed and constructed so that the in which a completely controlledatmosphere may be maintained for the heating and Working of metalarticles.

Since the construction illustrated is obviously capable of considerablemodification, we do not wish to be understood as limiting ourselves tothe particular impact arrangements of the mechanism per se or to theparticular feeding mechanisms illustrated except as hereinafter claimed.

We claim:

1. In an impact-device, aligned horizontally opposed die supportsmounting dies, electrically controlled fluid pressure actuated means toimpel said die supports toward one another for high speed impact of thedies at a selected point upon work disposed therebetween and toimmediatciy retract the same, means to regulate the force exerted by theimpelling means on the individual die supports in moving said diesupports toward one another to thereby insure accurate meeting of thedies at said selected point, electrically controlled means to positionwork at said selected point successively and in such timed relation tooperation of said iinpelling means that the dies meet upon the work, anda common circuit for both of said electrically controlled means.

2. In an impact device, aligned horizontally opposed die supportsmounting dies, electrically controlled fluid pressure actuatedmeans toimpel said die supports toward one another for high speed impact of thedies at a selected point upon Work disposed therebetween and toimmediately retract the same, means to regulate the force exerted by theimpelling means on the individual die supports in moving said diesupports toward one another to thereby insure accurate meeting of thedies at said selected point, electrically controlled means to positionwork at said selected point successively and in such timed relation tooperation of said impelling means that the dies meet upon the work,electrically controlled means to render the impelling means inoperativewhen the dies meet at other than said selected point, and an electriccircuit interconnecting all said electrically controlled means.

3. In an impact device, aligned horizontally opposed die supportsmounting dies, fluid pressure actuated means to impel said die supportstoward one another for high speed impact of the dies thereof with workdisposed therebetween and to immediately retract the same, means toregulate the force exerted by the impelling means on the individual diesupports in moving the die supports toward one another to thereby insureaccurate meeting of the dies and work, means to support work in verticalalignment with and above the meeting point of dies on the work, andmeans to release said work for gravity fall and to actuate saidimpelling means in such timed relation that the dies meet upon thefalling work.

4. In an impact device, aligned horizontally opposed die supportsmounting dies, fluid pressure actuated means to impel said die supportstoward one another for high speed impact of the dies thereof with workdisposed therebetween and to immediately retract the same, means toregulate the force exerted by the impelling means on the individual diesupports in moving the die supports toward one another to thereby insureaccurate meeting of the dies and work, means to support work in verticalalignment with and above the meeting point of dies on the work, means torelease said work for gravity fall and to actuate said impelling meansin such timed relation that the dies meet upon the falling work, andmeans to render the impelling means inoperative when the dies meet atother than a selected point.

5. In an impact device, aligned horizontally opposed die supportsmounting dies, fluid pressure actuated means to impel said die supportstoward one another for high speed impact of the dies thereof with workdisposed therebetween and to immediately retract the same, means toregulate the force exerted by the impelling means on the individual diesupports in moving the die supports toward one another to thereby insureaccurate meeting of the dies and work, vertically adjustable means tosupport work in vertical alignment with and above the meeting point ofthe dies on the work, and means to release said work for gravity falland to actuate said impelling means in such timed relation that the diesmeet upon the falling Work.

6. In an impact device, aligned horizontally opposed die supportsmounting dies, electrically controlled fluid pressure actuated means toimpel said die supports toward one another for high speed impact of thedies thereof with Work disposed therebetween and to immediately retractthe same, means to regulate the force exerted by the impelling means onthe individual die supports in moving the die supports toward oneanother to thereby insure accurate meeting of the dies and work, meansto support work in vertical alignment with and above the meeting pointof dies on the work, electrically controlled means to release said workfor gravity fall, and a common circuit for both of said electricallycontrolled means.

7. An impact device comprising opposed aligned rams, drive mechanism toimpel simultaneously the rams in opposite directions at high speedcoaxially into forging impact with each other at a preselected point andthen immediately retract the rams, and means operative by overtravel ofeach of the rams with respect to said preselected point for renderingsaid driving means temporarily inoperative to again actuate the rams.

8. An impact device comprising opposed aligned rams, drive mechanism toimpel simultaneously the rams in opposite directions at high speedcoaxially into forging impact with each other at a preselected point andthen immediately retract the rams, said mechanism including controlmeans common to both rams operable to apply balanced impelling force onsaid rams, means to regulate the impelling force of said drive mechanismupon the rams to thereby control the acceleration and impact velocitythereof,'and means operative by over-travel of each of the rams withrespect to said preselected point for rendering said driving meanstemporarily inoperative to again actuate the rams.

9. In an impact device, aligned horizontally opposed die supportsmounting dies, fluid pressure actuated impelling means to impel said diesupports towardone another for high speed impact of the dies at aselected point upon work disposed therebetween and to immediatelyretract the same, means to regulate the force exerted by the im pellingmeans on the individual die supports in moving said die supports towardone another to thereby insure accurate meeting of the dies at saidselected point, means to position work successively at said selectedpoint, and control means for said impelling means and said workpositioning means operable automatically to cause the latter to positionwork at said selected point in such timed relation to operation of saidimpelling means that the dies meet upon the work.

10. In an impact device, aligned horizontally opposed die supportsmounting dies, fluid pressure actuated impelling means to impel said diesupports toward one an other for high speed impact oi the dies at aselected point upon work disposed therebetween and to immediatelyretract the same,-means to regulate the force exerted by the impellingmeans on the individual die supports in moving said die supports-towardone another to thereby insure accurate meeting of the dies at saidselected point, means to position work successively at said selectedpoint, control means for said impelling means and said work positioningmeans operable automatically to cause the latter to position work atsaid selected point in such timed relation to operation of saidimpelling means that the dies meet upon the work, and means operative byover-travel of each of the die supports in respect to said preselectedpoint to render said impelling means temporarily inopera tive to againactuate the die supports.

